Based on your description, I think that you want to have a single website that can be reached from different domain name.
All the website having the same content.
If this is the case, you don't need JMS to acheive this objective as you only have to configuratoin your hosting server to share the same website directory (document root)
JMS does NOT share or does NOT synchronize the websites as explained in the product detail and also repeated in the FAQ
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/faq#sec-73
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/faq#sec-12
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/faq#sec-72
Q1) In standard, JMS create slave site with specific DB connection (at least different table prefix for each website).
Neverless, it is possible by manual procedure to create slave site using the same DB connection and table prefix. This can be used when you want to have exactly the same website but want to have a specific template directory in which you change the default layout.
In fact, if you have a single website (single DB with single table prefix) you don't need synchronisation as everything is identical.
Q2) In standard JMS, you have to re-install the extension in each slave site.
To avoid re-installing extensions, JMS gives the possibility to replicate a website.
In this case, up to you to pre-install extensions and data before the replication.
If you question is related to have a single DB with single table prefix, this question is not relevant as you share the same DB content. Automatically every thing is identical.
Q3) In standard JMS, the upload of files depends on the extension you are using to acheive this task. This depend how and where the extension save those videos.
If the video are saved in a shared directory for all the website, then it is perhaps possible to share them between the website. This will also depends if this extension save additional information into the DB that could make those video specific for a website.
If you question is related to the single DB and single table prefix then the question is not relevent as you have a single website.
Q4) See standard Joomla and its user groups properties (author, editor, publisher).
In JMS as remember at then begining of this reply, the users are totally independent and therefore manage the article is also totally independent.
If you question is related to the single DB and single table prefix then the question is not relevent as you have a single website.
I suggest that you have a look into the FAQ because I suspect that you think that JMS provide synchronisation between the website and this is NOT true.
JMS only share the files and folders on the disk.
See also the chapter 8 of the user manual that present the benefit in term of maintenance.
www.jms2win.com/documentation/doc_downlo...rs-manual-version-11
We are working on a JMS 1.2.x that will be able to share the users and perhaps also some extensions. We hope that it will be available this month or in july.